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 LED vu meter for 9V ?

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jonas Posted - Apr 15 2010 : 10:00:38 AM
Hi,

i saw your circuit for the led vu meter.

my question is the following:
you wrote, it is designed for 1V input.
But I want to use this circuit after a Booster stompbox, which
gives an output signal of about 9V. Is it enough to change the R4 with a TrimPoti, to scale the input voltage?

thanks, jonas.
2   L A T E S T    R E P L I E S    (Newest First)
jonas Posted - Apr 17 2010 : 03:10:36 AM
okay ... i see

thanks.
audioguru Posted - Apr 15 2010 : 10:16:59 PM
R4 is not a volume control.
The circuit as shown works poorly with a max input of only 1.25V. It is shown on the datasheet of the LM3915 with a max input of 10V. A resistor is added between pin 7, pin 8 and ground so that the pin 7 reference voltage is higher but it must be at least 1.5V less than the power supply voltage.

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